angularjs filter 详解

系统的学习了一下angularjs，发现angularjs的有些思想根php的模块smarty很像，例如数据绑定，filter。如果对smarty比较熟悉的话，学习angularjs会比较容易一点。这篇简单说一下angularjs的filter功能，angularjs的filter功能可分为二种，一种是内置的过滤器，一种是自定义的。

一，内置的过滤器

1，uppercase，lowercase大小转换

{{ "lower cap string" | uppercase }}     //结果：LOWER CAP STRING
{{ "TANK is GOOD" | lowercase }}         //结果：tank is good

｜这里的竖线是一种管道功能，如果对linux比较熟悉的话，这块的｜根linux的管道功能，基本是一样的

2，json格式化

{{ {foo: "bar", baz: 23} | json }}    //结果：{ "foo": "bar", "baz": 23 }

注意：bza没格式前是没有双引号的，格式化后就转换成了json数据了。

3，date格式化

{{ 1304375948024 | date }}                          //结果：May 3, 2011
{{ 1304375948024 | date:"MM/dd/yyyy @ h:mma" }}     //结果：05/03/2011 @ 6:39AM
{{ 1304375948024 | date:"yyyy-MM-dd hh:mm:ss" }}    //结果：2011-05-03 06:39:08

4，number格式化

{{ 1.234567 | number:1 }}    //结果：1.2
{{ 1234567 | number }}       //结果：1,234,567

5，currency货币格式化

{{ 250 | currency }}                 //结果：$250.00
{{ 250 | currency:"RMB ￥ " }}       //结果：RMB ￥ 250.00

6，filter查找

{{ [{"age": 20,"id": 10,"name": "iphone"},
{"age": 12,"id": 11,"name": "sunm xing"},
{"age": 44,"id": 12,"name": "test abc"}
] | filter:'s'}}    //查找含有有s的行

//上例结果：[{"age":12,"id":11,"name":"sunm xing"},{"age":44,"id":12,"name":"test abc"}]

{{ [{"age": 20,"id": 10,"name": "iphone"},
{"age": 12,"id": 11,"name": "sunm xing"},
{"age": 44,"id": 12,"name": "test abc"}
] | filter:{'name':'iphone'} }}   //查找name为iphone的行

//上例结果:[{"age":20,"id":10,"name":"iphone"}]

7，limitTo字符串，对像的截取

{{ "i love tank" | limitTo:6 }}           //结果：i love
{{ "i love tank" | limitTo:-4 }}          //结果：tank

{{ [{"age": 20,"id": 10,"name": "iphone"},
{"age": 12,"id": 11,"name": "sunm xing"},
{"age": 44,"id": 12,"name": "test abc"}
] | limitTo:1 }}     //结果：[{"age":20,"id":10,"name":"iphone"}]

8，orderBy对像排序

{{ [{"age": 20,"id": 10,"name": "iphone"},
{"age": 12,"id": 11,"name": "sunm xing"},
{"age": 44,"id": 12,"name": "test abc"}
] | orderBy:'id':true }}        //根id降序排

{{ [{"age": 20,"id": 10,"name": "iphone"},
{"age": 12,"id": 11,"name": "sunm xing"},
{"age": 44,"id": 12,"name": "test abc"}
] | orderBy:'id' }}           //根据id升序排

二，自定filter功能

我找了一个基本angularjs的mvc框架，phonecat，自定义filter也是在这基础写的，这个框架挺好用的。

1，filters.js添加一个module

angular.module('tanktest', []).filter('tankreplace', function() {
    return function(input) {
        return input.replace(/tank/, "=====")
    };
});

2，app.js中加载这个module

var phonecatApp = angular.module('phonecatApp', [
  'ngRoute',
  'phonecatControllers',
  'facebookControllers',
  'tanktest'
]);

3，html中调用

{{ "TANK is GOOD" | lowercase |tankreplace}}   //结果：===== is good